What does "YKK" stand for?

YKK was founded in Japan in 1934 by Tadao (pronounced in English as Tah-dah-o) Yoshida. In the early years, Mr. Yoshida's company carried his name; it was called Yoshida Kogyo Kabushikikaisha--or "YKK" for short. (That long Japanese name translates roughly into English as "Yoshida Company Limited.") Over the years, the letters "YKK" were stamped onto the zippers' pull tabs, and thus YKK became known as the Company's trademark. Today, the name of the brand is also the name of the company: YKK Corporation.